joe biden in lakewood, fremont, and lancaster ohio. paul ryan's in wisconsin, minnesota, and he ended his day in colorado. those two on the stump as well today. mike in pennsylvania, republican caller. is that right? caller: thank you. good show. for the rally in itself, just a few words on the metrics of it. it is a key swing county, if you will. there are really three. you will want to watch this county because this is one of the 3 key counties that is to watch. it went obama and by about 400,000 votes so you need to offset that. you can do that in the rural parts, but the key is really a few watch where this rally is, it's possible that you can marginalize that massive difference there to make up for the 400,000. here's the interesting thing. host: how you do that with the population center of philadelphia? caller: it's not easy, but there are large numbers in montgomery county and surrounding. if you look at the rural counties, they are all solid romney. that really chips away at it. then you have pittsburgh which is another urban